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B
Delphinus
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C
Pteropus
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D
Ornithorhynchus
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Solution
The correct option is DOrnithorhynchus Mammals are viviparous, i.e. they give birth to young ones. But there are some exceptions. The monotremes like Echidna (Tachyglossidae) and Platypus (Ornithorhynchus) are oviparous mammals.